Solid electrolyte membrane, solid lithium ion battery and preparation method of solid lithium ion battery

A solid-state electrolyte membrane and lithium-ion battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, solid electrolytes, etc., can solve the problems of unstable sulfide structure, poor interface performance, and many side reactions, and achieve enhanced strength , lower impedance, better stability

Active Publication Date: 2020-12-04
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned single solid electrolyte still has many problems. For example, although the oxide has high conductivity, its interface performance is not good.
The polymer electrolyte is in a gel state, on the one hand, the conductivity is low, on the other hand, its strength is poor, and the conductivity performance can only be exerted at high temperature.
The structure of sulfide is unstable and easy to expand, with many side reactions, and the preparation process will cause environmental pollution

Method used

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  • Solid electrolyte membrane, solid lithium ion battery and preparation method of solid lithium ion battery
  • Solid electrolyte membrane, solid lithium ion battery and preparation method of solid lithium ion battery

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preparation example Construction

[0046] 3. Preparation method of solid-state lithium-ion battery

[0047] A third aspect of the present invention provides a method for preparing a solid-state lithium-ion battery, comprising the following steps:

[0048] Take polyvinylidene fluoride with a molecular weight between 600,000 and 1,200,000, place it in lye and react at 50 to 70°C, stir continuously during the reaction, then repeatedly wash with deionized water and absolute ethanol, and dry to obtain a Alkali-washed and dried polyvinylidene fluoride;

[0049] Adding alkali-washed and dried polyvinylidene fluoride, in-situ polymerization monomers and initiators to the first organic solvent, and polymerizing in a nitrogen atmosphere at 60-80°C to form a homogeneous solution;

[0050] adding a small amount of fast ion conductor powder to the homogeneous solution several times, adding lithium salt, stabilizer and dispersant at the same time, and stirring to form a uniform slurry;

[0051] Scrape the slurry on a tetra...

Embodiment 1

[0057] Preparation of solid electrolyte membrane:

[0058] 1) Take polyvinylidene fluoride with a molecular weight between 600,000 and 1,200,000, place it in lye and react at 50 to 70°C for 4 hours, stir continuously during the reaction, then repeatedly wash with deionized water and absolute ethanol, and dry That is, polyvinylidene fluoride that has been washed and dried by alkali;

[0059] 2) Add 5wt% polyvinylidene fluoride, 4.5wt% polyethylene glycol diacrylate (Mn=1000), 1wt% vinyl n-butyl ether and 0.055wt% AIBN initiator through alkaline washing and drying to the DMF solvent, Polymerize in a nitrogen atmosphere at 60-80°C for 8 hours to form a homogeneous solution;

[0060] 3) 15wt% garnet-type LLZO (Li 7 La 3 Zr 2 o 12 ) powder was added to the homogeneous solution several times in a small amount, and 10wt% LiTFSI, 0.02wt% citric acid and 0.025wt% dispersant BYK-180 were added at the same time, first ultrasonically stirred for 6 hours, and then rapidly stirred for ...

Embodiment 2

[0069] The difference with embodiment 1 is:

[0070] Preparation of solid electrolyte membrane:

[0071]1) Take polyvinylidene fluoride with a molecular weight between 600,000 and 1,200,000, place it in lye and react at 50 to 70°C for 4 hours, stir continuously during the reaction, then repeatedly wash with deionized water and absolute ethanol, and dry That is, polyvinylidene fluoride that has been washed and dried by alkali;

[0072] 2) Add 5wt% polyvinylidene fluoride, 4.5wt% butyl acrylate, 1wt% polyethylene glycol methacrylate and 0.055wt% AIBN initiator after alkaline washing and drying to the DMF solvent, at 60-80°C Polymerize in a nitrogen atmosphere for 8 hours to form a homogeneous solution;

[0073] 3) 15wt% garnet-type LLZO (Li 7 La 3 Zr 2 o 12 ) powder was added to the homogeneous solution several times in a small amount, and 10wt% LiTFSI, 0.02wt% citric acid and 0.025wt% dispersant BYK-180 were added at the same time, first ultrasonically stirred for 6 hours...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a solid electrolyte membrane, which is prepared from the following components in percentage by mass:3 to 7% of polyvinylidene fluoride having undergone alkaline washing and drying, 3 to 7% of an in-situ polymerization monomer, 0.03 to 0.07% of an initiator, 10 to 20% of a fast ion conductor, 0.01 to0.05% of a stabilizer, 0.01 to 0.05% of a dispersing agent, 5 to 16% of a lithium salt and 50 to 70% of a first organic solvent. In addition, the invention also relates to a solid-state lithium ion battery and a preparation method thereof. Compared with the prior art, the solid-state electrolyte membrane disclosed by the invention has relatively high ionic conductivity and good stability, and thesolid-state lithium ion battery has good comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a solid electrolyte membrane, a solid lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently the most promising high-energy secondary batteries. Lithium-ion batteries have the advantages of less environmental pollution, high working voltage, long cycle time and large specific capacity, and have been widely used in automotive power batteries. It is a new type of new energy battery with market promotion and application at present. However, most of the existing lithium batteries use liquid electrolyte, which is prone to solution leakage and has the danger of inflammability and explosion. Therefore, improving the safety of existing lithium batteries is an urgent problem to be solved at present. [0003] The lithium battery electrolyte is mainly composed of solvents, electrolytes, and additive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525H01M2300/0082Y02E60/10Y02P70/50
Inventor 杨涛于清江江柯成陈先金黄善鹏姜斌龙绘锦
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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